>> A few months ago I reported a problem with UAX #18 using this page,
>
> [i.e., the web form on the Unicode site]
>
>> but I never received any confirmation other than that the web server
>> apparently accepted my message. The problem I reported was not
>> changed in this new update, so I don't have a lot of confidence in
>> this method of reporting problems. Here is what I submitted:
>
> FYI. Your report was dated July 22, and your feedback went into document
> L2/07-250, which was reviewed by UTC in the August meeting. We do try to be
> meticulous about formatting and sending these reports on to UTC, or
> individuals, as appropriate.

Thanks for letting me know what happened. However, this was all
invisible to me, and I think the feedback could be improved.
Perhaps you could send an email indicating that a topic has been
added to the L2 document and will be reviewed. A followup email
stating what the decision was regarding the defect report would
also have been appreciated.